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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf1265301cf73e81c4b0daf124c68a6bdf3a13960538f968dfe7a8739677cb1' 
  AND token = 'bMJynIJW93XG2lQPm/9m2p6txxeITi4E6poJ8v6w8QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}